Basic Documentation

8/44
Siemens Rotary actuators with spring return GCA…1 CE1Z4613en
Building Technologies Spring return actuators 2017-05-26
2.3 Description of functions
2.3.1 Description of functions for GCA...1
The functions are listed in a table and are assigned to the respective modes of control.
Type GCA12..1 / GCA32..1 GMA13..1 GCA16..1 GCA161.1E/MO
Mode of control Two-position Three-position Modulating Modbus RTU
Positioning signal with
adjustable characteristic
function
- -
Y = DC 0...35 V with
offset Uo = 0...5 V
and
span ΧU = 2...30 V
-
Rotary movement,
direction of rotation
Clockwise or counter-clockwise movement depends on the mounting position of the damper shaft.
When operating voltage
is supplied, the actuator
travels from 0° ⇑ 90°.
When operating voltage is
supplied and depending on
the control, the actuator
travels
∂ from 0°⇑ 90° (open)
∂ from 90°⇑ 0° (close)
When control is interrupted,
the actuator remains in the
respective position.
∂ When operating
voltage and a
positioning signal are
supplied, the actuator
travels to the
requested position.
∂ After interrupting the
positioning signal, the
actuator travels to
position
Y = DC 0 V.
On the setting of the
respective parameter
Spring return
On power failure or when the operating voltage is switched off, the spring return moves the actuator to its
mechanical zero position.
Position indication:
Mechanically
Angular position given by the position indicator.
Position indication:
Electronic
Connecting the feedback
potentiometer to an external
voltage source results in
voltage supply proportional
to angular rotation.
Position indicator:
Output voltage U =
DC 0...10 V is
generated
proportional to the
angular rotation.
By Modbus register
value
Self-adaptation of rotary
angle range
-
When self-adaption is
active, the actuator
automatically detects
mechanical end of the
rotary angle range.
Auxiliary switches
The switching points for auxiliary switches A and B can be set independent of
each other
in increments of 5° within 5° to 90°.
-
Powerpack (two actuators,
tandem-mounted)
Mounting two actuators of the same type on the same
damper shaft doubles the torque. (with accessories
ASK73.1).
Mounting two
of the same
actuator types on the
same damper shaft
results in a double torque
(with accessories
ASK73.2).
Not permissible
Response on damper
blocking
The actuator is equipped with an automatic switch-off mechanism.
Manual adjustment
∂
When no voltage is applied, you can turn the actuator to any rotary angle position (using a hex
wrench) and lock by using a screwdriver, or the adjustment tool.
∂ The actuator returns to the zero position on mechanical unlocking by means of a hex wrench (turn in
"90°" – open" direction) or by shortly supplying operating voltage.
Limitation of angular
rotation
The angular rotation range can be limited mechanically
by inserting the shaft adapter in 5° increments.